Chemistry, 25.07.2019 19:30, robertotugalanp1wlgs

What is the ratio of lactic acid (ka = 1.37x10-4) to lactate in a solution with ph =4.54?

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Henderson–Hasselbalch equation is given as,

pH = pKa + log [A⁻] / [HA] (1)
Solution:
Convert Ka into pKa

pKa = -log Ka

pKa = -log 1.37 × 10⁻⁴

pKa = 3.863

Putting value of pKa and pH in eq.1,

4.54 = 3.863 + log [lactate] / [lactic acid]
Or,
log [lactate] / [lactic acid] = 4.54 - 3.863

log [lactate] / [lactic acid] = 0.677

Taking Anti log,
[lactate] / [lactic acid] = 4.75
Result:
4.75 M lactate salt when mixed with 1 M Lactic acid produces a buffer of pH = 4.54.

answered: Guest

a mercury barometer is a device that uses the physical properties of mercury in a tube to measure barometric pressure. mercury barometers are used for : -

1. measurement of atmospheric pressure

2. determining the altitude of a place

3. weather forecasting

4. calibration and checking of aneroid barometers

5. application in fluid mechanics

6. measurement of pressure in aircrafts

7. surface weather analysis

8. preparation of barographs

9. usage in physical sciences like physics, astronomy & chemistry

10. preparation of aircraft altimeters

characteristics of mercury barometer : -

1.used to define and measure atmospheric pressure.

2.on the average at sea level the column of mercury rises to a height of about 760 mm.

3.this quantity is equal to 1 atmosphere.

4.it is also known as standard atmospheric pressure.

5.a barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on an exposed cistern of mercury at the base of the mercury column, the height of the column varying with atmospheric pressure.

Write 15 uses of a mercury barometer along with its characterestics

answered: Guest

Engineers have contribute to society in many ways like making the technology we use today or any type of power energy material

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